Expansion of Ki67-positive hepatocytic cells in liver of mice with CCl
+ TSG-6 treatment. (A) IHC for Ki67 in liver sections from representative control, CCl4, CCl4 + NC, and CCl4 + TSG-6 mice (×40). (B) Ki67-positive hepatocytes were counted and graphed (ANOVA, *P <0.05 versus CTRL, #P <0.05 versus CCl4, $P <0.05 versus CCl4 + NC-CM). ANOVA, analysis of variance; CM, conditioned medium; CTRL, control; IHC, immunohistochemistry; NC, negative control; TSG-6, tumor necrosis factor-inducible gene 6 protein.